Fuel-supply pump for internal-combustion engines



Apr. 17, 1923.

H. F'. LEISSNER FUEL SUPPLY PUMP FOR INTERNAL COMBUSTION ENGINES Filed Dec. 29 1921 2 Sheets-Sheet l Apr. 17, 1923. 1,452,428

H. F. LEISSNER FUEL SUPPLY PUMP FOR INTERNAL COMBUSTION ENGINES Filed Dec. 29 1921 2 Sheets-Sheet 2 Patented Apr. 17, 1923.

l'l'ED STATE HARRY FERDINAND LEISSNER, OF SODERTALJE, Sl EDEN.

Application filed December 29, 1921.

T all whom it may concern:

Be. it known that I, HARRY FERDINAND LnissNER, a citizen of the Kingdom of Sweden, residing at Sodertalje, Sweden, have invented new and useful Improvements in Fuel-Supply Pumps for Internal-Combustion Engines, of which the following is a specification.

It has been already proposed in multicylinder internal combustion engines to use a single pump plunger or piston for supplying fuel oil to two or more cylinders.

The object of this invention is to provide a simple and reliable construction to enable the application of said principle for a special case,- that is for four stroke cycle engines having their cylinders arranged in pairs and in which each two cranks pass their dead centre at the same time. If the fuel supply pump receives its operative impulses through the crank shaft or through another shaft having the same speed of revolution as that of the crank shaft there will be obtained one pumping action for each revolution; if on the other hand the engine operates on the four stroke cycle principle, each cylinder requires one pumping action for every other revolution.

According to this invention the said fact has been made use of by the provision for the fuel admission valves of each pair of cylinders of a rocking shaft having two cams each of which controls one of said fuel admission valves, constructed as non-return valves, said rocking shaft being operatively connected to a control shaft rotating with half the number of revolutions as that of the crank shaft moving the pumps, in such a way that the two non-return valves controlled by one and the same rocking shaft will be opened alternately one time for each revolution of the said control shaft.

In the drawing, Fig. 1 is a cross section and Fig. 2 is a longitudinal section of a construction according to this invention, as applied to an internal combustion engine having one pair of cylinders. Fig. 3 is a diagrammatic view of a construction according to this invention as applied to an internal combustion engine having two pairs of cylinders.

Figure 4 is a longitudinal vertical sec- Serial No. 525,688.

tion of an engine to which the invention is applied.

Figure 5 is an end view of the same engine.

Figure 6 is an axial section of the pump device on an enlarged scale. A

With reference to Figs. 12 of the drawing, the reference character a indicates a crank arm which is assumed to be driven, as by means of an eccentric or the like, from a control shaft rotating with half the number of revolutions as that of the crank shaft driving the fuel supply pump. Said crank arm a is carried by a rocking shaft 7) having two cams c at diametrically opposite points said cams being each arranged to control one of two non-return valves cl and (Z each of which admits fuel to one of two cylinders from a common pump chamber. At each revolution of the said control shaft both of the valves will evidently be opened once at an interval corresponding to one revolution of the crank shaft of the engine.

The shaft 6 is provided with a well known valve packing g as shown in Fig. 2.

In Fig. 8 I have shown a modified form of valve control adapted for an internal combustion engine having two pairs of cylinders. In this case two rocking shafts. b, and 6 are provided. Shaft 6 controls by means of the cams 0 and 0 the two valves d, and d respectively, individual to one pair of cylinders, while shaft 6 controls by means of the cams c and 0, the two valves (i and d individual to the other .pair of cylinders. The rocking shafts are so displaced with respect to each other and will operate in order in such a way as to open the valves in accurate order.

The construction for obtaining said operation may be varied in many ways as will be clear to those skilled in the art.

The engine shown in Figures 4L and 5 comprises two pairs of cylinders, 1 and 2, the pistons of which operate on a common crank shaft 3. The crank shaft 3 carries at its one enda toothed wheel 4 meshing in a pinion 5. The

in the walls of a small casing 7 fastened to the engine crank casing 8.

Attached to the shaft 6 is also an eecentric 9 the strap 10 of which is pivotally connected to a guide-block 11 acting on the pump plunger 12.

At the top of Figure 6 the same members are shown as those in Figure 2.

In Figure 5 the crank arm a is shown. Furthermore Figure 5 shows an eccentric rod 13 connecting said arm a to the eccentric 1% on the control shaft 15 which is connected by the gear wheels l6 17, 18 and a to the engine crank shaft 3.

V'Vhat I claim as new, and desire to secure by Letters Patent is 1. In a four stroke cycle internal combustion engine, the combination with pairs of cylinders, of a common fuel supply pump a fuel admission valve for each cylinder a rocking shaft for each pair oi fuel valves, and two cams on each rocking shaft to each control one of said valves, said rocking shaft being driven from a control shaft, rotating with half the number of revolutions as that of the engine shaft operating the fuel supply pump.

2. In a four strok cycle internal comhustion engi -e, the combination with pairs of cylinders, of a common fuel supply pump a fuel admission valve for each cylinder a rocking; shaft for each pair of fuel valves and two cams on each rocking shaft to each control one of illl valves said rocking: shaft being driven from a control shaft r0 tating with half the number of revolutions as that of the engine shaft operating the fuel supply pump, and a valve packing surrounding said rocking shaft.

In testimony whereof I have signed my name.

HARRY FERDINAND LEISSNER. 

